The Creator. The great uni‑plural Supreme Being (regardless of form).
The consensus between species over the eons is that The El are a multi-dimensional, multi-faceted, multi-instanced entity that transcends any possible definition of “being” or “person” by lesser creatures — and yet where all facets are simultaneously highly personable, regardless of apparent form, and behave as a single entity.
Thus The El are always referenced in the plural, rather than the singular, even though both are correct.
The Zmee name for them is the First Cause.